Press Release

MT-Propeller’s Silent 7 was first certified on the Pilatus PC-12 in 2020.

Issued by MT-Propeller .

March 27, 2025

MT-Propeller Entwicklung GmbH has received the FAA STC SA11914IB and the EASA STC 10085161 for the installation of the seven-blade Silent 7 propeller MTV-47-1- ( )-C-F-R(P)/CFR260-361( ) on the Beech King Air 300, 300LW, B300, B300C series powered by two Pratt & Whitney Canada PT6A-60A propeller turbines: for models 300, 300LW, B300, B300C PT6A-67A: optional for models B300 und B300C. The Blackhawk XP67 conversion is also covered by this STC.

The seven-blade Silent 7 propeller was introduced to the general aviation market in 2020 when it was successfully certified on the Pilatus PC-12. More than 130 PC-12 are already flying with this high-performance seven-blade propeller. In 2023 the flight testing started to also certify this advanced propeller system for the Beech King Air 300 series to benefit from the Silent 7 MT-Propeller.

MT-Propeller vice president Martin Albrecht says, that the installation features the following advantages:

- General performance improvement (8% take-off and climb)

- No propeller speed restrictions on ground while operating in low idle

- Lower ITTs at high altitude, allowing a top speed increase up to 6 ktas or longer engine life.

- Unbeatable aesthetic ramp appeal

- Significant cabin noise and vibration reduction

- All models comply with the strict German Landeplatz Lärmschutz Verordnung noise regulations of 2010 for unrestricted airport operations in Germany and other European countries.

Due to the smaller diameter the seven-blade MT-Propeller for the Beech King Air 300 Series has more ground clearance for less blade tip erosion and FODs. The long-time proven MT-Propeller natural composite blades provide significant inside and outside noise reduction. They have no life limitation and are repairable in case of a FOD. They also provide best vibration damping characteristics for almost vibration free propeller operation and have bonded on nickel alloy leading edges for superior erosion protection of the blades.

MT-Propeller is the world leading natural composite propeller manufacturer with 30 propeller models from two-blade to seven-blade hydraulically controlled variable pitch propellers for engines producing up to 5,000hp, and two-blade to four-blade electrically controlled variable pitch propellers for engines producing up to 350hp as well as two blade fixed pitch propellers.

The high performance, light weight and durable MT-Propellers can be used on aircraft with piston engines and propeller turbines, as well as on airships, wind tunnels or hovercraft. MT-Propellers can be developed for nearly every aircraft type from motor gliders to regional airliners.

Fulfilling the highest certifications requirements, they are also supplemental type certified on Part 25 aircraft.

MT-Propeller is the holder of over 220 STCs worldwide and the OEM supplier for more than 90% of the European aircraft industry as well as 30% of the US aircraft industry. More than 33,000 propeller systems with over 115,000 blades are in service, and 180 million fleet hours have been performed on MT-Propellers. With the longest industry TBO of 4,500 hours or six years for the five-bladed turbo prop MT-Propeller has proven the reliability of its products over the years.

A factory certified network of 62 service centres provides best service and maintenance all over the world.